1 files changed, 20 insertions, 0 deletions

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index e568cc47a7f9..bef5d6f30975 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -74,6 +74,7 @@ struct smb_vol {
         unsigned server_ino:1; /* use inode numbers from server ie UniqueId */
         unsigned direct_io:1;
         unsigned remap:1;   /* set to remap seven reserved chars in filenames */
+        unsigned posix_paths:1;   /* unset to not ask for posix pathnames. */
         unsigned int rsize;
         unsigned int wsize;
         unsigned int sockopt;
@@ -745,6 +746,9 @@ cifs_parse_mount_options(char *options, const char *devname,struct smb_vol *vol)
         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
         vol->rw = TRUE;
 
+        /* default is always to request posix paths. */
+        vol->posix_paths = 1;
+
         if (!options)
                 return 1;
 
@@ -1023,6 +1027,10 @@ cifs_parse_mount_options(char *options, const char *devname,struct smb_vol *vol)
                         vol->remap = 1;
                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
                         vol->remap = 0;
+                } else if (strnicmp(data, "posixpaths", 10) == 0) {
+                        vol->posix_paths = 1;
+                } else if (strnicmp(data, "noposixpaths", 12) == 0) {
+                        vol->posix_paths = 0;
                 } else if (strnicmp(data, "setuids", 7) == 0) {
                         vol->setuids = 1;
                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
@@ -1679,6 +1687,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
                 if(volume_info.no_xattr)
                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
+
                 if(volume_info.direct_io) {
                         cERROR(1,("mounting share using direct i/o"));
                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
@@ -1781,6 +1790,17 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                                                 cFYI(1,("server negotiated posix acl support"));
                                                 sb->s_flags |= MS_POSIXACL;
                                 }
+
+                                /* Try and negotiate POSIX pathnames if we can. */
+                                if (volume_info.posix_paths && (CIFS_UNIX_POSIX_PATHNAMES_CAP &
+                                    le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+                                        if (!CIFSSMBSETFSUnixInfo(xid, tcon, CIFS_UNIX_POSIX_PATHNAMES_CAP, 0))  {
+                                                cFYI(1,("negotiated posix pathnames support"));
+                                                cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
+                                        } else {
+                                                cFYI(1,("posix pathnames support requested but not supported"));
+                                        }
+                                }
                         }
                 }
         }